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Derivatives and Risk Management Activities - Assets and Liabilities (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
contract
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
contract
Derivative assets and liabilities      
Asset Derivatives Fair Value $ 96   $ 108
Liability Derivatives Fair Value (183)   (481)
Broker receivable 95   $ 410
Net loss deferred in AOCI 219    
Net loss expected to be reclassified to earnings in the next twelve months 8    
Remaining loss expected to be reclassified to earnings through 2049 $ 211    
Number of outstanding derivatives containing credit-risk related contingent features | contract 0   0
Interest Rate Derivatives      
Derivative assets and liabilities      
Net deferred gain/(loss) recognized in AOCI on derivatives $ 7 $ (90)  
Derivatives in Hedging Relationships      
Derivative assets and liabilities      
Liability Derivatives Fair Value (43)   $ (50)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities      
Derivative assets and liabilities      
Liability Derivatives Fair Value (20)   (23)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Liability Derivatives Fair Value (23)   (27)
Derivatives Not Designated as a Hedge      
Derivative assets and liabilities      
Asset Derivatives Fair Value 96   108
Liability Derivatives Fair Value (140)   (431)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets      
Derivative assets and liabilities      
Asset Derivatives Fair Value 79   101
Liability Derivatives Fair Value (81)   (344)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net      
Derivative assets and liabilities      
Asset Derivatives Fair Value 13   2
Liability Derivatives Fair Value (8)   (1)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities      
Derivative assets and liabilities      
Asset Derivatives Fair Value 2    
Liability Derivatives Fair Value (7)   (14)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Asset Derivatives Fair Value     2
Liability Derivatives Fair Value (4)   (34)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets      
Derivative assets and liabilities      
Asset Derivatives Fair Value 1    
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities      
Derivative assets and liabilities      
Asset Derivatives Fair Value 1   3
Liability Derivatives Fair Value (4)   (6)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits      
Derivative assets and liabilities      
Liability Derivatives Fair Value $ (36)   $ (32)